0,0 → 1,120 |
/* |
* SSA/ASS decoder |
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include <string.h> |
|
#include "avcodec.h" |
#include "ass.h" |
#include "ass_split.h" |
#include "libavutil/internal.h" |
#include "libavutil/mem.h" |
|
static av_cold int ass_decode_init(AVCodecContext *avctx) |
{ |
avctx->subtitle_header = av_malloc(avctx->extradata_size + 1); |
if (!avctx->subtitle_header) |
return AVERROR(ENOMEM); |
memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size); |
avctx->subtitle_header[avctx->extradata_size] = 0; |
avctx->subtitle_header_size = avctx->extradata_size; |
avctx->priv_data = ff_ass_split(avctx->extradata); |
if(!avctx->priv_data) |
return -1; |
return 0; |
} |
|
static int ass_decode_close(AVCodecContext *avctx) |
{ |
ff_ass_split_free(avctx->priv_data); |
avctx->priv_data = NULL; |
return 0; |
} |
|
#if CONFIG_SSA_DECODER |
static int ssa_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, |
AVPacket *avpkt) |
{ |
const char *ptr = avpkt->data; |
int len, size = avpkt->size; |
|
while (size > 0) { |
int duration; |
ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL); |
if (!dialog) |
return AVERROR_INVALIDDATA; |
duration = dialog->end - dialog->start; |
len = ff_ass_add_rect(data, ptr, 0, duration, 1); |
if (len < 0) |
return len; |
ptr += len; |
size -= len; |
} |
|
*got_sub_ptr = avpkt->size > 0; |
return avpkt->size; |
} |
|
AVCodec ff_ssa_decoder = { |
.name = "ssa", |
.long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"), |
.type = AVMEDIA_TYPE_SUBTITLE, |
.id = AV_CODEC_ID_SSA, |
.init = ass_decode_init, |
.decode = ssa_decode_frame, |
.close = ass_decode_close, |
}; |
#endif |
|
#if CONFIG_ASS_DECODER |
static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, |
AVPacket *avpkt) |
{ |
int ret; |
AVSubtitle *sub = data; |
const char *ptr = avpkt->data; |
static const AVRational ass_tb = {1, 100}; |
const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, ass_tb); |
const int ts_duration = av_rescale_q(avpkt->duration, avctx->time_base, ass_tb); |
|
if (avpkt->size <= 0) |
return avpkt->size; |
|
ret = ff_ass_add_rect(sub, ptr, ts_start, ts_duration, 2); |
if (ret < 0) { |
if (ret == AVERROR_INVALIDDATA) |
av_log(avctx, AV_LOG_ERROR, "Invalid ASS packet\n"); |
return ret; |
} |
|
*got_sub_ptr = avpkt->size > 0; |
return avpkt->size; |
} |
|
AVCodec ff_ass_decoder = { |
.name = "ass", |
.long_name = NULL_IF_CONFIG_SMALL("ASS (Advanced SubStation Alpha) subtitle"), |
.type = AVMEDIA_TYPE_SUBTITLE, |
.id = AV_CODEC_ID_ASS, |
.init = ass_decode_init, |
.decode = ass_decode_frame, |
.close = ass_decode_close, |
}; |
#endif |